I personally receive in either fashion, depending upon who is doing the administering.
Most people with their mouth open, tongue out and head tilted back are probably holding their breath (at least I do).
Mistakes certainly happen (moving the head, closing the mouth, etc.) but hand touching hand when you don't know where those hands have been is probably not a good idea either.
I would think that the best way to avoid problems would be to receive the Host only, rather than the Precious Blood as well. Even with fortified wine and wiping and turning the chalice, that is probably a higher risk.
the grasp of the eucharist is the same for priest distributing on tongue vs. putting in hand. Both can be done without touching. But mistakes occur.
This is all common sense, a priest touches the host after either having his hands breathed on or his hand touching someones tongue inadvertently from someone with a virus or communicable disease, then wants to give it to you.
Over some, presumably a similar amt. of contact with hands during distribution of the host on the palm. The grasp of the host is the same in both. The amt. of unintended contact is presumably the same in both.
One involves breath(communicable transmission route CTR) and saliva contact(CTR) , the other involves hand touching(CTR). However close quarter breath and saliva are higher risk over hand transmission. READ!
The priest pouring cold water over his hands is not washing
— I am arguing with someone who is very imprecise!
Good luck